Recently, after a long trip I have noticed that the car started to use too much oil, 1L+ for 2000km (before I was adding 0.5-1.0L along 15000km and changing it afterwards). So I started to look where the leak was coming from and it seems that it is the ignition distributor causing the problem. Unfortunately I have remembered to take the pictures only after the disassemble and some cleaning, but the red zone, in the following picture, indicates where I had the oil spot, propagated to the lower parts of the engine.
So the questions are:
1) What is actually causing the oil leak? The rubber between the ignition distributor and the cap(that rubber was full of oil and actually with bad quality)? I have been reading a bit about it, seems that also can be the O-ring?
2) How I can actually disassemble the distributor further? There are 3 small bolts attaching the plastic part to metal, but I will not be able to remove it in any way, because of the rotor. I have a picture from another side, I see small stopper(?) there (see the picture below).
3) Before fully disassembling it, what are the marks which are needed to be done? I have understood the importance of the marks, after not putting it back correctly yesterday and having acceleration problems today :D (which I already got fixed).